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Topic

Peter Ciuffetti

Subject: Changing values of xsl:variables
Author: Peter Ciuffetti
Date: 25 May 2000 01:22 PM

Hello,

From my reading of the XSLT spec, xsl:variables are essentially constants.

Yet I didn't learn this until after I had gotten into the habit with Stylus of writing stylesheets that freely changed variables. Though I find it very helpful to be able to do so, I'm finding that my stylesheets don't work in other XSL processors if I take advantage of this capability in Stylus. Is this a 'feature' of Stylus or a 'bug'? Is it likely to disappear? Here's an example of Stylus letting me change a variable and the same stylesheet under Xalan:

--------------------------------------------

Input test document:

<?xml version="1.0"?>
<test>
<child>a</child>
<child>b</child>
<child>c</child>
<child>d</child>
</test>

--------------------------------------------

Stylesheet:

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:template match="*|/">
<xsl:apply-templates/>
</xsl:template>

<xsl:template match="text()|@*">
<xsl:value-of select="."/>
</xsl:template>

<xsl:template match="test">
<xsl:variable name="ctr" select="0"/>
<test>
<xsl:for-each select="child">
<xsl:variable name="ctr" select="$ctr + 1"/>
<child><xsl:value-of select="$ctr"/></child>
</xsl:for-each>
</test>
</xsl:template>

<xsl:template match="child"/>

</xsl:stylesheet>
--------------------------------------------

Output produced with Stylus:

<test>
<child>1</child>
<child>2</child>
<child>3</child>
<child>4</child>
</test>

--------------------------------------------

Output produced with Xalan:

<test>
<child>1</child>
<child>1</child>
<child>1</child>
<child>1</child>
</test>

(Deleted User)

Subject: Changing values of xsl:variables
Author: (Deleted User)
Date: 25 May 2000 03:06 PM

The spec reads, "It is an error if a binding established by an xsl:variable or xsl:param element within a template shadows another binding established by an xsl:variable or xsl:param element also within the template." It would seem both Stylus and Xalan have a bug in not signalling the error. This will be fixed in a future release. Thanks for your report.

Alex Lloyd
eXcelon corp.

Peter Ciuffetti

Subject: Changing values of xsl:variables
Author: Peter Ciuffetti
Date: 31 May 2000 07:22 AM

When I use an xsl:variable inside a template, is it going to get a new binding every time the template is invoked, or will the binding be permanent after the first time the template is called?

E.g.

<xsl:template match="*">
<xsl:variable name="theName" select="name()"/>
...
</xsl:template>

(Deleted User)

Subject: Changing values of xsl:variables
Author: (Deleted User)
Date: 31 May 2000 10:58 AM

The scope of a variable declared in a template is one template instantiation. Successive instantiations will receive new instances of the variable.

Alex Lloyd
eXcelon corp.

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